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<textarea name='code' class='java:nogutter' rows='15' cols='120'>
/*
 * SmartGWT (GWT for SmartClient)
 * Copyright 2008 and beyond, Isomorphic Software, Inc.
 *
 * SmartGWT is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 3
 * as published by the Free Software Foundation.  SmartGWT is also
 * available under typical commercial license terms - see
 * http://smartclient.com/license
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 */

import com.smartgwt.client.types.TitleOrientation;
import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.IButton;
import com.smartgwt.client.widgets.form.DynamicForm;
import com.smartgwt.client.widgets.form.fields.*;
import com.smartgwt.client.widgets.form.fields.events.ClickEvent;
import com.smartgwt.client.widgets.form.validator.RequiredIfFunction;
import com.smartgwt.client.widgets.form.validator.RequiredIfValidator;

public class FormConditionallyRequiredSample implements EntryPoint {

    public void onModuleLoad() {

        final DynamicForm form = new DynamicForm();
        form.setWidth(250);
        form.setTitleOrientation(TitleOrientation.TOP);

        ToolbarItem toolbarItem = new ToolbarItem();
        
        IButton button = new IButton("First");        
        IButton button2 = new IButton("Second");        
        toolbarItem.setButtons(button, button2);

        final RadioGroupItem radioGroupItem = new RadioGroupItem();
        radioGroupItem.setName("willAttend");
        radioGroupItem.setColSpan("*");
        radioGroupItem.setRequired(true);
        radioGroupItem.setVertical(false);
        radioGroupItem.setValueMap("Yes", "No");
        radioGroupItem.setRedrawOnChange(true);
        radioGroupItem.setTitle("Will you be attending the meeting on April 4th? If no, please provide a reason");

        TextItem textItem = new TextItem();
        textItem.setName("reason");
        textItem.setTitle("Reason");
        RequiredIfValidator ifValidator = new RequiredIfValidator();
        ifValidator.setExpression(new RequiredIfFunction() {
            public boolean execute(FormItem formItem, Object value) {
                String valueStr = (String) radioGroupItem.getValue();
                return "No".equals(valueStr);
            }
        });
        ifValidator.setErrorMessage("Please provide a reason");

        textItem.setValidators(ifValidator);

        ButtonItem buttonItem = new ButtonItem("validate", "Validate");
        buttonItem.addClickHandler(new com.smartgwt.client.widgets.form.fields.events.ClickHandler() {
            public void onClick(ClickEvent event) {
                form.validate();
            }
        });

        form.setFields(toolbarItem, radioGroupItem, textItem, buttonItem);
        form.draw();
    }

}
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